The invention discloses a plug-in module of a surge protector, comprising an upper cover, a lower cover, a state coupling rod, an overvoltage protecting and connecting component and a state indicator, wherein the upper cover and the lower cover are combined to form a shell of the plug-in module of the surge protector, the lower cover comprises a central mould frame and a side mould frame, an open hole is formed at the bottom of the side mould frame; the state coupling rod is arranged in the side mould frame of the lower cover and provided with a push rod, the push rod is penetrated through the open hole and extended out of the lower cover, and the push rod comprises a communication antenna; an energy storing spring is arranged in the side mould frame and connected with the state coupling rod for pushing the state coupling rod to move during malfunction; the overvoltage protecting and connecting component is arranged in the central mould frame of the lower cover; and the state indicator is positioned at the top of the lower cover and covered by the upper cover.